Questions asked by Chrisx316

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• How many moles of Ca2+ are present in 5.67 moles of calcium phosphate? I"m not sure how to approach the problem.
  
• Part A: Determine the empirical formula when the elemental composition by mass shows: 40.0% C, 6.71% H, 53.3% 0. For that I got CH2010 simplified to CHO5 Part B: Determine the molecular formula when the mole mass of the compound is 90.08 g/mol. (Help?)
  
• Calculate the empirical formula for the compound found to contain 2.82g/Na, 4.35g/Cl and 7.83g/O. My biggest question is, when you get to the step where you divide all three subscripts, by the smallest number, how do I get rid of the decimal?
  
• Write a balanced equation for the following, including physical states: Magnesium + Hydrochloric Acid > Magnesiumchloride + Hydrogen gas Mg + HCl > MgCl + H Is that it? I feel like I'm missing something.
  
• How would I determine the correct Lewis structure for NO3- (or any compound)? is it okay for the central atom to have a lone pair? I chose the structure that showed this (in a multi-choice question). But the correct answer showed N and O with a double bon
  
• I've found the number of moles of each gas (H2 and H2O) using PV = nRT. Now. I need to find the theoretical yield of H at STP. Can you refresh my memory on how to do that? Is it different with gases?
  
• Arrange each group of compounds in order of increasing boiling point. Explain?
  
• Having trouble balancing a chemical equation. How would I balance this?
  
• The volume of 9.00 grams of carbon dioxide vapor at STP is 11.2 L. How would I figure that out?
  
• How many liters of O2 (g) are needed to react completely with 56.0 L of CH4 (g) at STP to produce CO2 (g) and H2O (g)? Given: CH4 (g) + 2O2 (g) → CO2 (g) + H2O (g)
  
• Which molecule would have a Lewis Structure that is an exception to the octet rule?
  
• Chlorine and Bromine have similar properties. What is the best explanation for this?
  
• Can someone clarify freezing point depression and boiling point elevation for me?
  
• What volume of 2.50 M #"HCl"# in liters is needed to react completely (with nothing left over) with 0.750 L of 0.100 M #"Na"_2"CO"_3#?
  
• Can someone explain the Bronsted-Lowry definition of acids and bases?
  
• If 22.15mL of 0.100M sulfuric acid is required to neutralize 10.0mL of lithium hydroxide solution, what is the molar concentration of the base? How would I approach this problem?